/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineSessionInterface.h
Delegate fired once a single search result is returned (ie friend invite / join) Session has not been joined at this point, and requires a call to JoinSession()
typedef TMulticastDelegate_ThreeParams< void, int32, bool, const [FOnlineSessionSearchResult](API\Plugins\OnlineSubsystem\FOnlineSessionSearchResult) & > FOnSingleSessionResultComplete